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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760c81f48b5d47af0315fb228295748e5e6049864643d2e69777bb848d5d9600' 
  AND token = 'VxJ0+LKe+WnDg4YubTYdAbI6desR4FY+POIzDkC87qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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