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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f72f5f90f0de97f04229d086a853766a37a7f92e53ac216422a89e24acd804' 
  AND token = '4lWslXmVcvh7Q0AXIEgJaCyHmfRCT0Zb3OA3TQ5wcJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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