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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d36b31c41001a6f8324d49132391a83395238e0aa9a33380c2519b5baea7b8' 
  AND token = 'G5CNEIEbi6m+Mler5eWGMmbSnEBCYFXuqlvsYHKstSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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