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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348bb96c5929c35fa9618944f8784ff04244b132627e12fa5d15eac2f2d74247' 
  AND token = '19nYXg7UzrQQNOhwxxcVwFdfk3v4UYI8qpbNN1hgcoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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