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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ba747342eb45470ef76ccb1e3dc0c3b43a79bee10ee355a16d22e924b35f9c' 
  AND token = 'RKhxT8Pds0ma1ClhxzZ2yKcpMES9rGTAqRmptb6oVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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