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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f838eee2c3ebc88c6740d28cee6557b088c1443e2e3981c7c3a9b8f458cb6acf' 
  AND token = '9MtRSGZ5MWbhv0NxNt2RU3iLodjnCg3vNSE5tHbZK7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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