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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4f48062c70dea3644ebfaa016b23ae46f93e1bb66fbc223a9bb1671b37fda6' 
  AND token = 'CNUFmPXskY4ieFCc10fK5ohYMFddUqkX8b3rz5d/MQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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