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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3624f52af531af2955918f6c9d09d03fd7d292e80a5947deb66f12ce8d1fcbc' 
  AND token = 'C3kB5UhHDcAnc1dLfQFhZfS7GWKGRU/rZH4OlEhw6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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