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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f29dec0a36cbeff783f4ccc95188e93dd8ae93257ec1414e986fd1bb2c080f' 
  AND token = 'gLIC2wOvKF60izCRgi4A0ETLEF/rVz1HXbd8cQGCp9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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