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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61eeb7202f86e5d8e66ac41c38f84b6ddac67748311792f6f21e2ff2777a7d9a' 
  AND token = 'ZFfl6955b+5Vdis5Dr+jayqzVEePEg/lysqw+6rb3aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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