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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230e45de9536be23ebead9bd5a12dc887b74a0ed724c7e805e58a3ffb059bd0e' 
  AND token = '9d/PzGJtvoBa6Ts/hxV0VbGgS8rP2lq24vT0EAg2aos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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