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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8c261f40f1716085c6b0916f41e344ecc05090b4488d184c78633a5ac296d' 
  AND token = 'oedQt4rZa7ut3IassdQeTAz2362yyTihZgF1K+eDrPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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