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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31ed828f2d1abbce569f7a26a74396365ea34a5906517e25e38f6c1a64175ad' 
  AND token = 'kw/2/HDBGFkJBVgiVhLabkpfX35HelG4oz0Jc5duN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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