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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007849eecda1b3bba721e2fba973a57c7a945dcb72f524236d574875d8f68d84' 
  AND token = 'fhwm3GuYQ5fSU1M6HTjYtfup/p2s2wM6tu5jZn8ZDNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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