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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e91e5d3fc7987749c8fc157724bbf76e3e9499455f3ff700622dc713fb9f355' 
  AND token = '77QFKtxXLS18fwKSeLUhb0EhjMlxvxnI9gG5jr7dS6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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