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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bef90521ac312042b320a0d31d81f2166e604db784a9d656d645c0a912d9724' 
  AND token = 's9ycwJf5OkAm+RVYNez4NspMEoonFE9Vid45p+npC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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