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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dff8d6ee0aa8ee95069a03b61bf275a65a226d8be7580f8c93931232e5f3c93' 
  AND token = 'pvwkOlPc2nkjrVCgzc1ieKRPbJ/V1c5NRz8OPYmGkUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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