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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ede673379e0c5bf625748b048e9fc7632d4d33c4d4f609417c7dd926c9aeb95' 
  AND token = 'EuMo5i5JbB38Rmo1Rq7TZZ4L+oVWlPbRVQzz/OPkXr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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