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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7c8b0c57c8f04ee2f1e7958b973df57c6284c79664df47526aff1e4cce0667' 
  AND token = 'pmC65jImSYhmws2gXc1lmDcZj22CBLz/eR9f6GTOIB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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