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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b8230ab12fc91bccac1bb604f2d8691700a60fa278ce3e1f1a7213f46549f3' 
  AND token = 'AdYV9v0xVI9rFTQqdPbBN9esIDyJttGf5XFdcXyAkD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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