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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edadf0a5d04e67b31443f85415f48c991b6e511aa26355b7b13e2bfdd54ee2e2' 
  AND token = 'BjuqeW/WO27WMZ58+tImeMlKPIviCIinpH74P90vyug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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