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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bae4f997b7d144b43479ca1c40ee475d7a04a77d36446ccb982dc6fa3d22100' 
  AND token = '/rVGOFCMjAKGzLmdz3p6CYoBi8loIuS2Yk8jWHwsen4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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