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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9012830b7b46e9a19e71da0f94a31553e4890d7b561b76efc9a56554114e33' 
  AND token = 'Zwbv39JrLrZulWJ64tcrDbcSlAhvw4LJIfAxr23hiqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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