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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a298fab7005c2a40c15a1f39069f81fbf4bdba365553f3c42db7133dabffbf2' 
  AND token = '9YS8W5rW6OOEjjggujS69gf5G5RsrN9Sc3qpUNZGLJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}