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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeae9ed6ba308c7ee836ae07f787f60e005ee9f7a3f02c35b287defef2e93837' 
  AND token = 'rlvEfswoX+LwkDl5QrMq2vDniF8igJe/uV1sn0StYm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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