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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3bc14338d97c3ea7cf9b4df8949d288408e6d8bbd4cc37f4abfe259c325d89' 
  AND token = 'OJGxB8xEvly8l1Llxrintb09z2o//Q9esUm6lMfelb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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