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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a211aecff50e564fd66db2d809e4e98ae0c59f3587f12119782420da6534d2' 
  AND token = 'KvW2kEW+5vVhx2F4MB3r5husccyNGfAZGrssL8Y6yOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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