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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1cb6f6c82bcd3b6742c4ab9e84eb9b061aa9c1e0d7fb58eb7113511a4a6128' 
  AND token = 'XujB5ikkxvWW5ZXPB4aE6I1W+y1R0/V0CPTUMffMFLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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