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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262db1bcc3b2e08f6761aee35b191f499f297254b3bd35e25681d83ef1691599' 
  AND token = 'Vez75201cD8M9qqKDJMplagzzrdV9fTjXKmZSB0F0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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