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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40d829ff2baa1fbcb037d04749e309f00b1e1caab98e3ba6376ff7864c661f2' 
  AND token = 'mzf1iKUcr2a9jFgB3ZLNz1khkAxR9KCH4tGq5f6ZQ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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