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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16763b48b204d7055d4b172dd3d213a89c3d9d14c540058236c34aeeb9be1e31' 
  AND token = 'DLE2F0Eigk9hNbDNed3mcOIv/xM55XPSXqpd8wS6UWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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