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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbbb090aa33c5a0bb9fa8ce55d32cee5d21239119d8b25d4e9d32537f48281d' 
  AND token = 'tI6nwa/3LwCKlfRDFEKYNWwWxMY7CMXgSFn6k9YDr7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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