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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7585a08a0556736f99035c601144b092544e96bec116e86cc94da75c0e02ba3' 
  AND token = 'dJhpVCqESZ2/T0slAPV+hz6IO97M73JP9cUGa51v670=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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