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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2fefdc208406ee71dace55b9ec695e56b6b1009577f06a402eff356f7a687c' 
  AND token = '6utDq1pt/BWoGh8Ihhcs69hAHO1WNykpo9vWkMy9MXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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