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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74a24fc77856fb101f4c9e3747785d9bd1ffa993634123152448cfe2939918f' 
  AND token = '5oynNjF6oXjKX8wRKR7x5oDGmjAq0md1slUQSV8oZsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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