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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c931562edaf8a5f9cf30827e0fee146b5630c345604fce79de1b11df67827124' 
  AND token = 'ds3Biy74WrAE/8fJVB+bRfwbShn6Cg4+TX4OF+CK8Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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