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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b479da9d7dec2163a5c54487ed2bd6711926a249a36eebda89f5a06c21d3b53' 
  AND token = 'CFTlRBwDUyR4lQG3hB8MrTqX1uoptYc5fwIgLty9DtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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