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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41961cf3dda3dd8e8f0d911cd60f67171174b76c52753d5ce5265423afc347dd' 
  AND token = 'xlfaWCDMl2BdkYyDKXI62gqtumh9M6ZFS19jiA3Fmtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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