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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2985cca1e663382b344db271c8764054887385d1b1e9190ba294d6ae287207d6' 
  AND token = 'VtNdK4J5igrEcs/Xs2ApMf64NGo++IbL8JCb7NTVdV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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