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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c320c5c14c37646e5a6fa39f121f290099d6fedf9aac698d58595ef1f6ecce' 
  AND token = 'rwgh4zrVaUfvlg6M03UA8MByNwUPYKvNDqd5znu7tOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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