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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94be4ccd9461ab05c87f12f3d3c9066f2f2d9202b0ae211bcfc7e01e6211d7d8' 
  AND token = '9n7Jvr2ORvZ7Bphz7PY+5vEGeFarE94Bucfi3u6pPJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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