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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28e59ca260255e7614dcead8b108013e2550f445e2e6504ec31b0400a70440d' 
  AND token = '19nBtuk1+qYChKWZ23Z08gdhx4FGqCHVbb8Acl1VF08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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