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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c868ec4e3acf5526f72803b2dcf08c7f509f44e4a9fd7c5fa1c077e88576be' 
  AND token = 'm7jsouEHlZpWUz144IClXUK5NzPkO/9SRYHyjqhe9fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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