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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ccf0e66d62ea5d39badacc798b8415e99c4e7c7e1935757cceb4b898e04dcf' 
  AND token = 'yKII3OJcs8utkXpUqXczWOeNUioSwKCnGzK3MlR4wss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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