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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731dd8b9edc2e180ae7acf2f59fff85c5ccffaacef3ae7064a1868860f54bca5' 
  AND token = 'GNPE0UK2BDRaMyXvZQOO8kP/tLATIxK3hd1x1EZ/pnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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