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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1b852025196f91d5086c7d26c5aaa0ba08d336dba7aa428a15028d40469fb3' 
  AND token = 'r8P131MknHW/snI7fvjHhMHnDFQj5x+renFgRqWTDB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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