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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a968c9329459dcfe5a7c1616a0f199dc9c88133122f63f9e508b503bf7aae6fb' 
  AND token = 'KXoK6c/qWb1cKD9p6uLD/sdCIFpEwkj2A0RqRoO9sQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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