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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8f7023cb005c21ead67b4f3b1b7059b219cf48a307fae78ae058b5b60c8b11' 
  AND token = '0H1o+oAW09kd2M9/Q1zYhpcYF39xZ4a/uCn5+wpeBNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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