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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d649e7e75d69a572f8fa5a43ffaf67065f80ca7a060de6865f6ec84b04775f' 
  AND token = 'WFtLwrw3G2Wd3KuvZnoijBL5y04eilr9YlB5FuiXoU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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