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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e5f135aa2eb080799bc53b4476084316669d3160d14e5bff9b7e6775e281dc' 
  AND token = 'uBD3PI0ikFXWv8W4K3o6krVunvgrYDUJvXT9z6WNgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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