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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7eb941f84fb02de4478c8684c5af30f3414400ba943e89bb28634a22d9c9dd' 
  AND token = 'c63X4398LcptOUM3Tsl3aEjwedze82wOPUN98ug/+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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