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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee8843f6c1f7a1594e05d9851037bad6f6a88b7d454af5922ec557c36a57415' 
  AND token = 'nWPU0qybu74PsKUWU5NlsunUhrm0wxf0ZARPQ2jx5M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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