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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec842f4e19e18e82e6d88d301be6f569d5b937c79f96ae3ebd4006e62b10d0a5' 
  AND token = 'Tk254pdVFG5lO1HcQTJ/QArz876qPo5DsUzNIUmUHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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