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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12fdda0828e0463c6b089d9f494023e221b5742516c801480d4bf7b1bef5ce7' 
  AND token = 'rGvt1xs7Z/PfX5gqe3bXdPpD8YtS28Udzu7QgCM1zCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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