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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd504c5daae829b01bafe5c6a3fb1b7022b53ddb6d183313512fa469663a1e8' 
  AND token = 'AllZ86je0wlrveUVsIBWvBDL7sV75dB9LgMR2FzQr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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