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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c805da5bb78567a4c2bfeef5a7e6585f6dabe645d747348dbb83de80d469a4d' 
  AND token = 'BNkWxBtXUiQFg6JDw9uw6h0vB2sifFjQWqRXpfEfo7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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