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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f2679cb493158d99a740c3af8b657725bd93f2604dd22f08e0ac4e1d0f7e34' 
  AND token = 'nzKZJ1zb9/imJ7z5EOXNY+IdBln9224N4WChVuIDdC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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