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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a69c61a0ce8e2df250bf4dc8de6096ea49d4189afbe83b4f87a6f249d76f431' 
  AND token = 'RzYgMubE08vTWyLAUxHMwwgUJ5jFXY7zDfcb3GdSGS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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