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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf711c8a0570f1fdeedf253b50ba03163418d889b45d423811ade6f2156ead25' 
  AND token = 'V/mbVZ3XhrRmhDPxFN6tUdJ+UWmNKa/ULRC3YT4UDAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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