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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a63c477a9179812532c4f4ca369bc17012f57f701576e0516ae01a0b4836d62' 
  AND token = 'TovG7vUFYsHVt2nNYg9SS9HcBw/T6QauRf0HBOv+O38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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