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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028ee0b65930f720313229a1531e1805d4f72f4ec29edd59d154781fce62c0ad' 
  AND token = '61MAYBFirGtK9jdAsOVYMBMf/BqmCmFlAoD5eJw7hyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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