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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd5995965d2a785eaf4aef95b37c1919254b91f6da50cf820cba56ee5896a23' 
  AND token = 'SQ8JaPjD16p5M/D3FdkioAoqeTX205VTcfEfbkN4X7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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