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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38daca7be07c4b365cf69dd06815eb8aa1554165330bc819ac951cc77827eb82' 
  AND token = '533rI0xVYqagwY/Y2QshIa/YEFcsTj5f92XaWHEBmVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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